rtc: gemini: Add optional clock handling
This makes the Gemini optionally take two clock references to
the PCLK and EXTCLK. As we are adding a clock framework to the
Gemini platform we need to make sure that we get the right
references.
Acked-by: Hans Ulli Kroll <ulli.kroll@googlemail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/rtc-gemini.c b/drivers/rtc/rtc-gemini.c
index 5279390..cf766e0 100644
--- a/drivers/rtc/rtc-gemini.c
+++ b/drivers/rtc/rtc-gemini.c
@@ -26,6 +26,7 @@
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/clk.h>
#define DRV_NAME "rtc-gemini"
@@ -38,6 +39,8 @@
struct rtc_device *rtc_dev;
void __iomem *rtc_base;
int rtc_irq;
+ struct clk *pclk;
+ struct clk *extclk;
};
enum gemini_rtc_offsets {
@@ -127,6 +130,27 @@
return -ENOMEM;
platform_set_drvdata(pdev, rtc);
+ rtc->pclk = devm_clk_get(dev, "PCLK");
+ if (IS_ERR(rtc->pclk)) {
+ dev_err(dev, "could not get PCLK\n");
+ } else {
+ ret = clk_prepare_enable(rtc->pclk);
+ if (ret) {
+ dev_err(dev, "failed to enable PCLK\n");
+ return ret;
+ }
+ }
+ rtc->extclk = devm_clk_get(dev, "EXTCLK");
+ if (IS_ERR(rtc->extclk)) {
+ dev_err(dev, "could not get EXTCLK\n");
+ } else {
+ ret = clk_prepare_enable(rtc->extclk);
+ if (ret) {
+ dev_err(dev, "failed to enable EXTCLK\n");
+ return ret;
+ }
+ }
+
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res)
return -ENODEV;
@@ -156,6 +180,10 @@
{
struct gemini_rtc *rtc = platform_get_drvdata(pdev);
+ if (!IS_ERR(rtc->extclk))
+ clk_disable_unprepare(rtc->extclk);
+ if (!IS_ERR(rtc->pclk))
+ clk_disable_unprepare(rtc->pclk);
rtc_device_unregister(rtc->rtc_dev);
return 0;